muller



R. L. MULLER.

ADDING MACHINE.

APPLICATEOH FILED 050.23, 1913.

1 97,774. Patented Nov. 22, 1921'.

7 SHEETSSHEET l.

X Z 6 b 3 GE W 25g ATTORNEYS R.L. MULLER.

ADDING MACHINE.

APPLICATIOW FILED DEC.23,1918.

1,397,774. Patented Nov. 22, 1921.

7 SHEETSSHEET 2.

' M INVENTOR A. A TTORNE R. L. MULLER.

ADDING MACHINE.

APPLICATION FILED 050.23, 1918.

Patented Nov. 22, 1921.

7 SHEETS-SHEET 3.

ATTORNEYS R. L. MULLER.

ADDING MACHINE.

APPLICATION FILED DEC.Z3| 19m.

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ADDING MACHINE.

APPLICATION FILED 0Ec.23,191a.

Patented Nov. 22, .1921.

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R. L. MULLER.

ADDING MACHINE.

APPLICATION FILED 020.23.1918.

1,397,772. Patented Nov. 22, 1921.

I I SHEETSSHEET 6. Fig. [5 I H 77 R. L. MULLER.

ADDING MACHINE.

APPLICATION FILED DEC.23, 1918.

1,397,774. Patented Nov. 22, 1921.

7 SHEETS-SHEET 7.

I V/TNESSES UNITED STATES PATENT OFFICE.

ROBERT L. MULLER, OF DETROIT, MICHIGAN, ASSIGN'OR TO BURROUGES ADDING-MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ADDING-MACHINE.

Specification of Letters Patent.

Patented Nov. 22, 1921.

Application filed December 23, 1918. Serial No. 268,065.

T 0 all 20 7mm it may concern Be it known that I, ROBERT L. MULLER, acitizen of the United States, residing at Detroit, in the county ofWayne and State of Michigan, have invented certain new and usefulImprovements in Adding-Machines, of which the following is aspecification.

My invention provides an adjunct to the commercially familiar adding andlisting machine as the same has been somewhat highly developed in recentyears in the matter of bookkeeping functions. I refer in particular tothat line of development which has to do with tabulations through thelateral shift of a paper carriage, the machine being adapted to makebookkeeping entries as, for example, upon a relatively wide ledger sheetof a loose-leaf ledger system. The invention adapts itself to a machineof this character whose registering mechanism is such as to performsubtraction as well as addition, and so care for both charge and credititems.

The development referred to has extended to the point of providing foran automatic succession of operations of the machine by motor,involvingtabulating shifts of the paper carriage and in turn a control of themotor by the paper carriage.

It has been common heretofore to equip the paper carriage withcontrolling devices, such as tappet pieces, cams, and rollers, which,through cooperation with various settable elements of the machine,determine just how the machine shall perform, in the matter ofregistering and recording, with the paper carriage in its differentcolumnar positions. Such devices have been made adjustable so as toprovide for various settings as regulated by the particular accountingwork in hand, and in order to avoid numerous adjustments when changingfrom one kind of accounting work to another, it has been the practice toemploy interchangeable carriers for the controlling devices, such asrods or bars detachably mounted in the paper carriage. Thus, on one suchbar the controlling devices would be set so as to provide for one kindof accounting entries, for example those pertaining to charge items,whereas a different bar would have controlling devices arranged uponitin such manner as to take care of a different set of entries, forexample those pertaining to credit transactions. In certain classes ofwork this would occasion frequent interchange of bars or rods, involvingin each instance release of fastenings, removal of one bar, insertion ofanother, and then readjustment of the fastenings.

Now by my invention I go a step further and do away with the necessityfor any interchange of bars or rods, or any removal of one set ofcontrolling devices and substitution of another, when occasion arisesfor alternating between two different sorts of bookkeeping entries. ThusI provide for changing cooperative relationships between controllingdevices, which remain upon the carriage, and the settable elements ofthe machine, by simple manipulation of a fingerpiece. In the form ofembodiment of my invention here shown this involves the mere shifting ofa slide-plate between two positions, such slide-plate being permanentlymounted upon the paper carriage.

Referring to the drawings which accompany and form part of thisspecification, Figure 1 represents a left-side sectional elevation ofthe complete machine, except for omission of some well known parts, suchas the total key system of links and levers and the ink ribbon feedingmechanism with which it is not necessary to deal; Fig. 1 is a detailelevation showing certain parts omitted from Fig. 1 to avoid confusionof dotted lines; Fig. 1 is a sectional elevation on a plane farther overin the machine, that is to say adjacent to what is known as the printingsection, and this view is confined to a limited area thereabout; Fig. 2is a right-side sectional elevation of the machine, omitting most of theinterior mechanism which it is not necessary to here illustrate, thisView having principally to do with motor control mechanism; Fig. 2*(sheet 6) is a detail elevation looking rearward and on a planeindicated by the line 2 -2 of Fig. 2; Fig. 3 is a detail elevation of anen.-

larged sca e and-under a different setting of 100 certain parts whichappear less clearly at the upper middle portion of Fig. 2; Fig. 3 is adetail elevation of certain other parts, illustrating an adjustment ofthem which is clifferentfrom that shown in Fig. 2; Fig. 3

is a View similar to Fig. 3, illustrating a difi'erent condition fromthat obtaining in either Fig. 2 or Fig. 8; Fig. 4 is a horizontalsection taken substantially on the line 44 of Figs, 1 and 2 with someparts broken 11 an enlar ed scale taken on line 4 4 of.

Fig. 4; ig. 5 represents an example of work, the left-hand portionrepresenting part of a customers statement and the righthand portionpart of a ledger sheet; Fig. 6 is a rear elevation of the lower portionof the paper carriage and part of the back panel of the machine, someparts being broken away for purposes of clearer illustration; Fig. 6illustrates the construction at the extreme right where the tabulatingrod is extended to receive a stop finger or dog; Fig. 7 is a sectionallan view taken substantlally on the line 7 of Fig. 6; Fig. 8 is asimilar sectional plan view but with certain parts broken away andfurther differing from Fig. 7 in that a different adjustment 'of partsis illustrated; Figs. 9, 10, 11 and 12 are respectively vertical crosssections taken on lines 99, 10-10, 11-11, of Figs. 6'and 7 and 12-12 ofFig. 8; Fig. 13 is a sectional rear elevation illustrating tally rolldevices and omitting parts not directly concerned; Figs. 14 and 15 aredetail crosssections on lines 14-14 and 15l5 of Fig.

13; Fig. 16 is a detail perspective view of a certain lugcarrying rod ofthe hammer blocking mechanism; Fig. 17 is aperspective View of certainparts of the subtraction control.

Ua-Wiage control equipment.

Inasmuch as the invention relates essentially to the equipment at therear of the machine, having to do with the functioning of partsmountedupon the paper carriage and'is not necessarily characterized by theparticular performances of the mechanism of the machine proper and thecontrol of the carriage equipment, I shall first proceed to describe,the specific carriage control equipment without stopping to followthrough the various effects produced in the operations of the machineproper under that control. With regard to settable elements of themachine proper with which elements the controlling devices onthe'carriage directly cooperate, it will sufiice for the present torefer to a gang of lever arms spaced rearwardly from the back panel ofthe machine casing. Said panel is designated by the numeral 2 and thereis secure to it a rearwardly extending tubular bearing piece or sleeve 3beyond which are located the lever arms above mentioned, the same beingdesignated respectively 4, 5, 6 and 7. The latter (7) is fastened to ashaft. 7 a (Fig. 4) and the other arms are fastened respectively tosleeves 4", 5 and 6 which are nested together and with' said shaft,these nested parts running through the bearing sleeve to the interior ofthe machine. The lever arms appear'in most of'the figures of thedrawings and legends are applied to them which .indicate the sort ofcontrol they exercise re- The next arm, 5, has the legend Non-add,

indicating that it functions in the matter of keeping out of action theregistering mecha-:

nism in an operation of the machine. The next arm 6 is labeled Repeatwhich indicates that it functions in a motor-driven machine inconnection with automatically successive operations of the machine. Theremaining arm 7 is labeled Hammer block, which signifies that itfunctions in connection with the printing operations of the machine byway of eliminating imprints, this being done selectively as betweendifferent subdivisions of the printing devices.

All of said lever arms project upwardly and to the left as the parts areseen from the rear, and at their ends their upper edges are of camformation (varying to some extent as between the arms) to cotiperatewith the controlling devices mounted upon the paper carriage, whichdevices, in the present construction, take the form of rollers. A numberof sets ofrollers are here shown laterally spaced apart, and at certainplaces there are two or more rollers to a set. In view of the variety ofeffects produced by these rollers of the several sets, I shall designate them by separate reference numerals as I proceed with thedescription. (It will, of course, be understood that the number andarrangement of rollers may vary indefinitely and that the particulararrangement here shown and described is merely a typical one suited tothe character of book-entries which I have selected for the purposes ofthe present disclosure). The invention is more particularly concernedwith the multiple sets of rollers located where the section lines 99,10-10, 11l1 appear in Fig. 7. and I shall now proceed with a descriptionof these rollers, referring particularly to that figure of the drawings.and to the sectional views Figs. 9. 10 and 11.

I have already mentioned the fact that .the control rollers are carriedupon the paper carriage. The frame of this carriage is designated 8 andits end plates are designated 8. The familiar oscillatory tabulating rod9 extends between lower portions of these end plates. Above and alittlet-o the rear there is another rod 10 extending between these endplates, its squared ends occupying correspondingly shaped notches in therear edges of the plates and the rod being held in place by latches 11which engage cud-studs of the rod. The rod is prevented from rotating byreason of its squared ends engaging the aforesaid notches, and it isthis rod which carries all of the control rollers. The rod is groovedfrom end to end in its rear side to provide for adjustably loeating therollers or sets of rollers along it. It will of course be understoodthat the particular location of the rollers must be regulated by thetabulation being dealt with, the latter being determined by theadjustment of familiar stop-fingers 12 along the other rod 9 forcooperation with the usual fixed stop-piece on the back panel of themachine. (This stop-piece which is of yoke form maybe seen in Fig. 1where it is designated by the numeral 13). There is a collar 14 for eachroller or set of rollers, which collar embraces the rod 10 and has ascrewthreaded socket to receive a bearing stud, in the form of a bolt 15upon which the roller or rollers are journaled. A saddle 16 occupies thegroove of the rod and projects on both sides of the collar (right-handend of Fig. 8) and the bolt has a reduced inner end which bears againstthe saddle to clamp it in place and thus hold the collar at the desiredlateral position upon the rod.

, Referring now to the construction especially illustrated by Fig. 9,there is a roller 17 adjacent the collar 14 which in this instance has astepped hub-like formation, the larger portion of which registers with arecess of the roller into which recess the smaller portion of thehub-like formation extends. A spring l7 surrounds the latter and tendsto thrust the roller rearward, or to the right as the parts are hereseen. The roller. itself has a hub which spaces it from a compoundroller composed of two grooved sections 18 and 19. Rearwardly beyondthis compound roller, and spaced from it slightly by a washer, there isj ournaled upon the bolt 15 an arm 20, the hub of which is of camformation as best seen in Figs. 7 and 8. Beyond the hub of this armthere is secured to the bolt, just behind its head, a collar 21 having acam formation complemental to that of said hub. Under the conditionillustrated by Fig. 9, and also by Fig. 7, the high surfaces of the twocams are in en gagement with-each other, in consequence of which thespring 17"" is compressed and the rollers held forward, whichestablishes a certain cooperative relationship between them and thebefore-mentioned lever arms to be hereinafter specifically referred toin connection'with a typical example of accounting work.

Before proceeding to a detailed description of the other and somewhatdifferent constructions and arrangements of the two other sets ofrollers, it may be well to point out that a swinging of the arm 20counterclockwise from the position in which it appears in Fig. 6, willresult in carrying the high surface of the cam hub of said arm past thehigh surface of the cam collar '21, so that the spring 17 a is permittedto thrust the rollers rearward, or to the right as the parts are seen inFig. 9. The result of this will of course be to differently relate therollers to the lever arms. Thus, whereas under the condition illustratedby Fig. 9 the sections 18 and 19 of the compound roller engage theNon-add and Repeat lever arms respectively, and the roller 17 isforwardly beyond all of the arms, yet when the rollers have been thrustrearward by the spring, the roller 17 will be alined with the Subtractlever and the compound roller will be alined with the Repeat and Hammerblock lever arms, and both rollers will be out of alinement with theNonadd lever arm, as shown in Fig. 8. Of course, it will be understoodthat the shifting of the rollers one way or the other is not done. at atime when they are over the lever arms because, as will be obvious fromFig. 9, the rollers would be obstructed by. one or more of said arms.

Referring next to Fig. 10, there isa triple compound roller journaled onthe bolt 15 and spaced from the collar 14 by.a washer 26, said rollercomprising two. sections 27 and 28 of the same diameter, and a section29 of smaller diameter. There is another roller 30 of larger diameterthan any section of the compound roller and it is recessed so that thesmall section 29 may telescope within it as illustrated in this figureof the drawings. The compound roller is recessed to accommodate a spring31 which surrounds the bolt 15 and tends to thrust the roller 30rearward, or to the right as the parts are seen in Fig. 10. An arm 32,which is a counter-part of the arm 20, is journaled upon the bolt 15rearward of the roller 30, and a cam collar 33, which is a counterpartof the cam collar 21, is secured to the bolt behind its head. The effectof swinging the arm 32 counterclockwise is the same as in the case ofthe arm 20, except that in this instance the spring does not thrust theset of rollers forward, but only the roller 30 of the large diameter. Asthe parts are illustrated in Fig. 10, the latter roller is alined withthe Hammer block lever arm and is depressing the same to the maximumextent. The small section 29 of the compound roller is, of. course,inactive, being contained within the'large-diameter roller 30. The othersections 27 and 28 of the compound roller are alined, respectively withthe Non-add lever arm and the Repeat lever arm. Forward shifting of thelarge diameter roller uncovers the small diameter section 29 of thecompound roller, and the latter then functions to depress the Hammerblock lever arm to the minimum extent. In connection with thedescription hereinafter to be given of a typical example of work, itwill be explained how varying degrees of depression of this particularlever arm will result in varying extents of hammer-blocking.

Referrin next to the construction illustrated by Fig. 11 here, there'issimply a double or compound roller oftwo sections 40 and 41 of the samediameter. A spring 42 surrounding the bolt 15 between this compoundroller and the collar 14 tends to thrust the roller rearward and in Fig.11 it is shown in its rearward position. There is an arm 43 of similarcharacter to the before-described arms 20 and 32, which arm is journaledupon the bolt 15 rearward of the compound roller, and there is also acam collar 44 similar to the cam collars 21 and However, there is areversal of the cam relationship here; thus, when the high surfaces ofthe previously described cams are in engagement as illustrated in Fig..7, and also in Figs. 9 and 10, the opposite is true of the cam hubof arm 43 and the cam collar 44, so that the spring 42 holds thecompound roller 40-41 rearward, as shown in Figs. 7 and 11'. Thecounterclockwise swinging of the arm 43, in unison with such swinging ofthe arms 20 and 32, has the effect therefore of forcing the compoundroller 40-41 forward and compressing the spring 42. Having reference torelationship of rollers to lever arms, the sections of the roller arealined, respectively with the Repeat and Hammer block lever arms underthe Fig. 11 condition, whereas when the arm 43 has been swungcounterclockwise the sections 40 and 41 of the roller are alined,respectively, with the Non-add and Repeat lever arms, as shown in Fig.12. As hereinafter pointed out, however, the Repeat lever arm is inneither case actually in. .a state of depression when the rollers cometo' rest under the tabul ating shift which carries them over the leverarms.

We have just above referred to the swinging of the several cam arms 20,32 and 43 in unison. This is accomplished through their connections witha slide-plate 50 which is mounted upon the upper side of a square rod orbar 51 extending between the end 8 of the paper carriage frame. Thisplate is slotted longitudinally at three places adjacent its rear edge,as clearly illustrated in Fig. 7, for the purpose of adjustablyaccommodating three fingers 52 which engage respectively, the forkedupper ends of the aforesaid cam arms. As clearly illustrated in Figs. 9to 11, each finger is part of a small plate which spans the associatedslot in the slide-plate and has lugs 53 projecting up into the slot. Ashort bolt 54 running down through the slot and through thefinger-plate, together with a nut 55 constitute clamping means forholding the finger'at the proper position along the slot of naomve theslide-plate. The latter is longitudinally slotted adjacent its rear edgewhere it overlies the square rod 51 and the plate is held.

upper ends, washers 58 being interposed between thenuts and the bar toprevent binding. At its left-hand end (as the parts are viewed in Figs.6, 7 and 8) the slide-plate has a down-turned lip 50 which is bentunderthe bar 51. This lip carries a hublike piece 60 in which slides aplunger 61 (Fig. 8) adapted to engage one or other of two sockets 51 inthe bar. A spring 62 surrounding the plunger within the hub 60 tends toenforce the engagement. A head 61 on the plunger serves as a handle bywhich to withdraw the plunger from the socket and also to shift theslide-plate one way or the other. 7

In Fig. 7 the slide-plate is shown set over to the right with theplunger occupying a corresponding socket, whereas in Fig. 8 thelide-plate is shown set over to the left. Under the particular set-uphere shown the latter position of the slide-plate ordains a relationshipof rollers and lever arms which provides for the proper control ofmachine-functioning when credit entries are being handled. The otherposition of the slide-plate, that illustrated by Fig. 7 and also by Fig.6, establishes the proper cooperative relationship for controlling thefunctioning of the machine when charge items are being handled. It willbe noted (Fig. 6) that appropriate inscriptions are marked upon the baradjacent the sockets,-- Cr. and Ch.

In connection with accounting work of the particular kind chosen forpurposes of responding diameter and a. section 72 of smaller diameter.Then toward the opposite end of the bar and beyond the three sets ofshiftable rollers, there are three single rollers laterally spaced alongthe bar, two of these, designated 73 and 74, are spaced a short distanceapart and both of them are alined with the Repeat lever arm. The thirdrolled 75 is alined with the Hammer block lever arm.

Tally roll control.

Before proceeding to deal with the typical example of work illustratedby Fig. 5, it will be well to point out certain auxiliary devices whichare under the controlof the slideplate. These have to do with the use ofa tally roll]? The tally roll is a well known thing as applied toBurroughs adding machines, and reference may be had in this regard totheLundgren patents 1,195,598 and 1,195,599, both issued August 22,1916. Inasmuch as the bringing of the tally roll into printing positionmay be desirable in conjunction with different tabulating shifts of thecarriage when dealing with different kinds of book entries, I providefor controlling certain tally roll tappet devices upon the carriagethrough the same manipulative means which operate to change theadjustment of carriage rollers. Thus in the present instance I equip theslide plate 50 with means for alternating between two tappet pieces inthe matter of their effectiveness to move the tally roll into printingposition. This equipment appears in Figs. 6, 7 and 8, but is more fullyillustrated by Figs. 13, 14 and 15, a portion of the tally roll carriagebeing illustrated in Fig. 13. It is there designated by the numeral 76and is illus trated as mounted to slide with the rod 7 6 whichconveniently serves as a pintle for the hinges of the back panel of themachine, as in thecase of the Lundgren construction above referred to. Aspring 76 .normally holds the tally roll carriage out of printingposition. It is shifted into printing position by the action of one oranother tappet piece on the main paper carriage against a spring-heldpivoted tappet blade 7 6 mounted upon the tally roll carriage.

Now in addition to the regular tabulating fingers 12, adjustably securedat intervals to the rod 9, there are similarly secured upon that rod atappropriate points, suitably spaced apart, a pair of collars 77 withdepending bifurcated lugs between which are pivoted tumbler tappetpieces 7" and 77 They are of general rectangular form and when either isset with its longer dimension extending vertically, it will operateagainst the tappet blade 76 to carry the tally roll carriage intoprinting position. The spacing apart of the two tumbler tappet piecescorresponds with a columnar shift of the main paper carriage, so thatwhen one of these pieces is set to operate the tally roll carriage itwill interpose the tally roll between the printing type and a columnspace of the ledger sheet which is next to the column space of thatsheet between which and the printing type the tally roll will beinterposed when the other of the two tappet pieces is set into effectiveposition.

The tumbler tappet pieces are operated by a slide bar 78 which fits agroove in the under side of the rod 9. This slide bar is notched at 78and 78. in its under edge near its opposite, ends. The tumbler tappetshave oblique tail pieces at upper corners, the same being designatedrespectively, 77 and 77 and projecting into the notches 78 and-78respectively. The location of the tail piece of one tappet is thereverse of the location of the'tail piece of the other tappet, so thatwhen the slide bar 78 has been shifted one way (as to the right in Fig.13) one tappet (77 will be held with its longer dimension. extendingvertically, and when the said bar has been shifted the other way thereverse condition will obtain. Dotted lines in Fig. 13 illustrate thelatter, and it will be understood that in the shifting back and forth ofthe bar 78 the walls of its notches 7 8 and 7 8 operate upon the tailsof the tappet pieces to turn them upon their pivots one way or the otherthrough ninety degrees, a straight edge of each tappet piece beingbrought to bear against a straight portion of the under edge of the bar.It will of course be understood that 1 when one of these tappet piecesis turned with its shorter dimension extending vertically it will bewholly above the tappet blade 76 on the talley roll carriage. Obviously,the tappet piece 77 will move the tally roll into printing position in atabulating shift of the main paper carriage occuring ahead of atabulating shift of said carriage in which the other tappet piece 7" canmove the tally roll to printing position. In the present instance thelatter tappet piece is effective under the charge adjustment of theslide plate 50, and the other tap-, pet piece 77 b is effective underthe credit a-djustment of said slide plate.

The shifting of the said bar 78 is done through the medium of a bracket79 a horizontal portion of which overlies the plate 50 and islongitudinally slotted for adjustable connection therewith and with thesquare rod 51. A depending portion of the bracket is carried around therod 9 and terminates in a finger 79 projecting rearwardly between twospaced lugs 7 8 on the under edge of the slide bar 78. When the slideplate is shifted one way this finger operates upon one of these, lugs toestablish the conditions illustrated by the full lines in Fig. 13, andwhen said slide plate is moved the other way the reverse conditions areestablished which are illustrated by t-he'dotted lines in said figure. 7Functions of carriage-controlled eZemen-ts,

Subtraction, repeat, nowaad, and hammer block.

As a further preliminary to specific refer ence to the typical exampleof work hereinbefore referred to as being illustrated by Fig. 5, it willbe well to explain somewhat further the functioning of the several leverarms without, however, for the present describing in detail the somewhatcomplicated connections which lead from the lever arms to differentdepartments of the machine. As

before stated, the foremost lever arm 4 0perates to set connections forconverting the registering mechanism of the machine from an adding to asubtracting condition. The effect is the same whichever one of therollers on the carriage rides upon and stands over this particular leverarm with the arrival of the paper carriage at some certain columnarposition. The registering mechanism is substantially identical with thatof the Rinsche Patents Nos. 1,172,484 issued February 22, 1916 and1,179,564, issued April 18, 1916. '1he effect of depressing the leverarm 4 is to set certain connections which, when the machine is thenoperated, cause the registering wheels 916 to be disengaged from theracks 610, and then the cradle 910 to be rocked clockwise (on its pivot910) in the main register frame 910 for engagement with the racks 610.At the beginning of the second half cycle of operation of the machinethese intermediate pinions will be brought into mesh with the racks andas the operation proceeds, theregister wheels 916 will be turnedbackward through the medium of said pinions. All of this is fullyexplained in said Rinsche patents and so-will require no detaileddescription here.

The rocking of the main register frame 910 to engage and disengagepinions and racks (either register pinions 916 or intermediate pinions916) is done in the familiar way, the action being initiated by theoperation of a wiper-pawl 821 upon a stud of a three-armed lever 913;Now it is a familiar expedient in these Borroughs machines to keepregistering pinions out of engagement with racks throughout an operationof the machine by disabling the said wiper-pawl.

In the present instance the .lever arm 5 functions to set certainconnections which will so disable said wiper pawl, and this applieswhether the registering" mechanism is at the time in adding orsubstrating condition. This will occur whenever any one of the rollerson the carriage rides upon and stands over the said lever arm 5 .in anycertain columnar position of the carriage.

The motordrive is in general similar to that disclosed in a number ofprior patents, as for example, the Vincent Patent 866,7 50 issuedSeptember 24, 1907, and the Kilpatrick Patent No. 928,981 issued July27, 1909. Reference may also be had to the Lundgren Patent 1, 033,109issued July 23, 1912 and to the Rinsche Patent 1,120,746 issued December15, 1914, for examples of repeat mechanisms applied to this motor drive,though for a somewhat different purpose than that here concerned, inthat Lundgren. and Rinsche were dealing with the matter of automaticrepetition of operations for multiplication. case of the two lastmentioned patents, there is a latching down of the motor release or Inthe present instance, as in the clutch closing devices when the startingbar tion. Thus when one of the carriage rollers stands over anddepresses the said lever arm 6, certain familiar key-releasing mechanismis prevented from performing its function and also prevented fromperforming the additional function of unlatching the motor release orclutch closing devices. Consequently when the machine operates with thecarriage in a columnar position with one of its rollers depressing thesaid lever arm, there will automatically ensue another operation of themachine by the motor.

It will of course be understood that as an operation of the machineconcludes, the paper carriage is released from the columnar position inwhich it has been standing throughout the operation and is automaticallyshifted tothe next columnar position.

It will further be understood that in order to provide for the making ofentries of the character shown in Fig. 5, which include date. entries,designating or folio entries, and amount entries, it is necessary forthe keyboard of the machine to have a large capacity. In the presentinstance it may be assumed that three rows of keys counting from theleft when viewing the machine from the front, are devoted to the settingup of the date entries, and that the next five rows of keys are used forthe setting up of designating numbers, and that the remaining rows ofkeys are employed for the setting up of amounts. This occasionssubdivision of the printing mechanism into as many as three groups,which is commonly referred to in the art as splitting and is ordinarilydone by omitting over-lapping tails of hammer-releasing latches at thedivision points, and so preventing the tripping of one latch by anotherat these points.

The remaining levenarm 7 functions in the latter connection to preventthe execution of printing strokes by the hammers in one or more of thesedivisions of the printing mechanism. It will have been observed thatthereare three different sizes of carriage rolle'rs which operate uponthe lever arm 7. Thus provision is made for setting the lever varm inany one of three different positions according to how far it isdepressed. The hammer-blocking devices of the present machine are Soorganized that when the said lever-arm is depressed to the least extent,as'e. 9., by the small roller 72, the hammers of the middle divisiononly are prevented from exec'1t1ng printing strokes, this being thedIVlSlOIl for printing designating or folio numbers. De-

pression of this lever-arm to a greater extent as by the middle-sizedrollers 19 or 41 will result in preventing the hammers of both thatmiddle-division and the hammers of the date division from executingprinting strokes. When the lever arm is depressed to the greatestextent, as by the large diameter roller 30, all divisions of the hammerswill be disabled.

Ewample of work.

Referring now to the example of work represented by Fig. 5, and assumingthat a ledger sheet A is inserted in the paper carriage of "the machine,and that alongside of it to the left there is inserted a customersstatement sheet B, the paper carriage will be first moved by hand to itsextreme lefthand position wherein the roller 75 may. function to preventany date or folio printing. With the carriage in this position, thecustomers old balance is set up and the machine operated once to printand register that amount. In the example here given it appears first as$500 and is printed on the top line of the ledger sheet at the extremeright. The registering mechanism of the machine is, of course, in addingcondition at this time. The paper carriage is then moved by hand to itsextreme right-hand position wherein the left-hand or charge section ofthe customers statement sheet is in position to be printed upon. In thisposition of the carriage its rollers 70, 71 and 72 stand over the leverarms 5, 6, and 7, respectively. The date, folio number, and amount to becharged are set up on the keyboard and the motor starting bar isdepressed and becomes latched down. Thereupon the machine goes through acycle of operations but as the lever arm 5 is depressed the registeringmechanism is kept out of action and as the lever arm 7 is depressed tothe least extent, the date and amount will be printed but the folionumber will not be printed (this entry 'has no place on the customersstatement).

The Repeat lever arm being down, the keys will not be released at theconclusion of thisoperation of the machine and the motorstarting deviceswill remain latched. The paper carriage is released at the end of theoperation (through familiar tabulating action) and moves over to thenext columnar position in which the right-hand section of the customersstatement stands opposite the printing type. Through timing deviceshereinafter described the automatically succeeding operation of themachine is delayed until the carriage has taken up its new position. Inthis new position the first of the shiftable sets of carriage rollerscomes into action, to wit: the set specially illustrated in thesectional view Fig. 10. Inasmuch as the slide-plate 50 is in the chargeposition, the condition will be as there illustrated no printing uponthecustomers statement.

(It will be understood that this right-hand section of the customersstatement sheet is for entries of credit items only.) The Non-add leverarm 5 is again down and therefore no registering operation will occur.The Repeat lever arm 6 is down as before so that the key-releasingdevices are still disabled and the motor starting devices are latcheddown. With the conclusion of this operation of the machine the carriageis again released and shifts to the next columnar position wherein thefirst column of the ledger sheet will be opposite the printing type.This brings the second of'the shiftable sets of carriage rollers intoaction, being those specially illustrated by the sectional view Fig. 9.The Hammer block lever i not depressed, so that date, folio number andamount are all printed on the ledger sheet. The Non-add lever arm isagain depressed so that the registering mechanism does not come intoaction. The Repeat lever arm is also again depressed so that when thecarriage has automatically shifted to the next columnar position anotheroperation of the machine will automatically ensue. The next column ofthe ledger sheet is used for the entry of credit items, so that whendealing with charge items there should be a blank in this column.However, it is customary in business establishments Where machines ofthis character are employed to use a tally roll for collecting allamount entries in a condensed list for bookkeeping purposes, and in thepresent instance such tally roll is automatically interposed between thetype and the ledger sheet when the credit column of the latter comesopposite the type. When the carriage has shifted to this particularcolumnar posi-' tion its third set of shiftable rollers comes intoaction, to wit: the set specially illustrated by the sectional view Fig.11. It will be noted that the Hammer blocklever arm is depressed by amiddle-sized roller in consequence of which the date and folio numberwill not be printed upon the tally roll. but only the amount. It will befurther noted that the Non-add lever arm is not depressed at all so thathere the charge amount will be registered and added to'the Old balancexoriginally registered upon the wheels. Of course there will be noprinting upon the ledger sheet because of the interposition of the tallyroll. Although the Repeat lever arm 5 appears in Fig. 11 as below theroller section 40. there is in fact a release of the restrainedkey-restoring devices with the in the example, the carriage will bemoved back to the first position, and the operations tions. Inasmuch asthe example calls for the above described will be repeated for the nextitem which'will be added to the previous charge item in the last of thefour operastriking of a new balance then, certain blank operations willnow be in order so that the machine may properly be prepared for thetaking of a total. Inasmuch as the machine here shown has a subtractingequipment of the character disclosed in the before-mentioned RinschePatent 1,172,484, it is necessary to provide for the execution of twoblank operations for the reasons set forth in said patent and which neednot be repeated in detail here. Suflice it to say that subtractioneffects require that the so-called fugitive one shall be taken intoaccount, and in the Rinsche construction a carrying action is had in theunits order for this purpose, and this takes place during the blankoperation customarily performed in all Burroughs machines for restoringthe ordinary carrying mechanism to normal. The second blank operationrestores the carrying mechanism of the units order. The last abovedescribed operation of the machine in doing the work represented by Fig.5, would cause a shift of the carriage another step or to a fifthposition. It may be noted here that in Fig. 6 the fifth tabulatingfinger 12 (counting from the right) is spaced a very short vdistancefrom the fourth of these tabulatin fingers, and it will be understoodthat a ful columnar shift is not required, because the next operation ofthe machine is to be a blank one. In this fifth position of the carriagethe roller 73 will depress the Repeat lever arm 6 which will serve thepurpose of causing the two blank operations to automatically succeedeach other. It will be recalled that in the operation of the machine atthe fourth columnar position the r y of the ey-board were released andthe motor starting devices unlatched. Consequently an operation of themachine does and then the second blank operation automatically ensues.because of the fact that carriage roller 74 has depressed the lever arm6 by passing over its V-shaped nose. This roller is so set as to pass onto the No. 3 po sition of Fig. 2 in order that no further automaticrepeat operation will take place, The carriage does not further shiftbecause the finger 12 then stopping it is not adapted, like those beforein action, to be automatically tripped. (See Benner Patent 1,046,546, ofDecember 10, 1912.)

The total which is the sum of the old balance of $500 and the two chargeitems of $345.65 and $222.45 may now be printed, $1048.10, and themachine cleared.

When credit items are to be entered the slide-plate 51 will be shiftedto the position'shown in Fig. 8 with the efi'ect'before described as tochange in position of rollers of the second, third, and fourth sets. The

customers statement and the ledger sheet having been again inserted, thecarriage the now old balance (being the previously printed total) willbe set up on the keyboard and registered as before with the carriage inits extreme left-hand position, and printed in the same column that the$500 old balance was printed and in horizontal alinement with thepreviously struck total imprint. When moved to the right, the carriagewill not be taken all the way back to its first position, as in the caseof charge items, but only to the second position where in the rollers ofthe Fig. 10 set are over the lever arms. The right-hand section of thecustomers statement will be opposite the printing type and the date andamount will be printed, upon operation of the machine at this columnarposition of the paper carriage. It will be recalled that the largediameter 30 is shifted rearward out of line with the Hammer block leverarm and the small diameter roller 29 uncovered, so that it will act uponthat lever. It does so with the same efiect that was produced under thecharge adjustment by the small roller 72, that is to say, the Hammerblock lever is depressed to the least extent and disables only the foliosection of the printing mechanism. The rollers 27 and 28 act as beforeto depress the Repeat and Non-add. levers and with the same effect asbefore described. The carriage shifts to bring the first column of theledger sheet opposite the type but this being the Charge column, thereshould, of course, be no printing upon the ledger sheet. However, thetally roll is interposed at this point to receive an imprint of the itemand it is to be noted that the rollers of the second shiftable set areso positioned as to depress the Hammer block lever arm the medium extentand also to depress the Repeat lever arm, and the foremost roller willbe moved to the seventh position, andf and the ensuing operation of themachine,

the date, folio number and amount will be printed in the second columnof the ledger sheet as shown in the example. The adjustment of therollers of the third shiftable set are as illustrated by Fig. 12, theNon-add lever being depressed so that the registerin mechanism does notcome into action. ere, as before, the forward section 41 of the doubleor compound roller, though standing over the Repeat lever arm, is notdepressing that arm, so that upon completion of the operation of themachine with the carriage in this particular columnar position, the keysare released and the motor starting devices are unlatched.

A second credit entry may then be handled, as in the'case of the secondcharge entry, and after that the'blank operations will be in order, andthe striln'ng of the new balance of $20.55 which is the differencebetween the old balance of $1068.10 and the sum of the credit entries of$547.57 and $500.00.

Subtraction control connections.

Referring now to the connections through which the lever arm 4 operatesto bring about a change in the registering mechanism from adding tosubtracting condition, the sleeve 4 to which that lever arm is securedcarries at its forward end just inside the casing of the machine, alever arm 4 which extends oppositely tothe lever'arm 4 as best seen inFig. 4. This lever arm 4 is notched at its extremity to embrace therearwardly extending arm of a bell crank lever 80 (Fig. 1) which ispivoted at 80 to the rearwardly extending arm of another and larger bellcrank lever 81 pivoted upon a frame stud 82. The first mentioned bellcrank 80 has a forwardly extending arm which by abutting against the hubof the bell crank 81 limits the possible movement of the bell crank 80under the action of a spring 83 which connects the depending arms of thetwo bell cranks. A spring 84 connects the upwardly extending long arm ofthe bell crank 81 with a frame stud, but this spring 84 is lighter thanthe spring 83,- in fact the latter is of such stiffness and strengththat when the lever arm 4 is elevated the two bell cranks will rock asone unless there should be some positive obstruction to movement of thebell crank 81. The spring connection between these bell cranks is merelyfor the purpose of safety and comes into action only in an emergency toprotect the parts in the event that there should be some blocking of orinterference with the proper movement of the bell crank 81. It will benoted that in Fig. 1 the roller 17 is over the lever arm 4 depressingthe same and elevating the lever arm 4 and the upstanding arm of hellcrank 81 is correspondingly forced against a limiting frame stud 86 andthere has been no change in relationship between this bell crank and thesmaller bell crank 80.

The tip-standing long arm of the bell crank 81 carries a stud 81 whichoccupies a notch in the upper edge of the widened rear portion of a link87, which portion, 87*, has a slot 87 occupied by av stud on asupporting plate 87 journaled upon the ribbon-feed shaft 501. The link87 extends forward and is coupled to a lever 88 which projects throughthe keyboard and has a handle by which it may be thrown forward andback. This lever corresponds with the one designated 10 in the RinschePatent 1,172,484, in that it may be manipulated by the user of themachine to change from an adding to a subtracting condition and viceversa. In the present instance, however, the lever is automaticallythrown through the connections just above described, provided the stud81 is seating in the notch of the link 87. It should be noted that thelink 87 can be disconnected from the bell crank lever 81 by depressingthe rear end of said link in opposition to a spring 89 that upholds it.This would be brought about through the setting of a socalled Normalkey, such as that disclosed in the Kilpatrick Patent No. 1,152,517issued Sept. 7th, 1915. Depression of such key (either the onedesignated 35 or the one designated 205 in said patent) lowers a leverarm 87 (Fig. 1 which overlies a stud 87 on the link 87. The mounting ofsaid lever arm and its connections with the special key or keys may beunderstood as being identical with the disclosure of said Kilpatrickpatent, wherein the corresponding lever arm is designated 24. The partsare best seen in the perspective view of Fig. 17 wherein a portion ofthe-Carriage normal key stem is illustrated and also a. portion of thestem of the Counter normal key, designated respectively 145 and 145 Inthe present construction the lever 88 is not integral with the arm 90(as in the prior Rinsche construction above referred to) which arm 90does the. work of shifting the registering mechanism. This work is donein the samemanner and through means suchas disclosed in said Rinschepatent, but the power is not derived from the hand lever 88. Instead itis derived from the-motive power of the machine. A link 91 is coupled tothe said arm 90 and extends rearwardly to the vicinity of the familiarpower-shaft 800. The latter carries a cross-arm 92 having up per andlower studs 92 and 92 The link 7 that is, to subtraction position asillustrated a in Fig. 1, the link 93 is elevated and elevates cated atits lower end and guided upon a frame stud 94. This link has an ear 93carrying a stud which occupies a slot 91 in the link 91. With the lever88 thrown forward,

the link 91 so that the upper hook-shaped portion at the rear of thelatter is in line with the stud 92. Consequently when the machine.operates and the power shaft 800 is driven in a counterclockwisedirection, the link 91 will be forced rearwardly and willcorrespondingly operate the arm 90 with the effect before described ofdisengaging the register wheels 916 from the rack and then rocking thecradle 910 to the subtraction position. When the arm 4 is .freed by thepassing on of the roller 17 in the next shift of the carriage, thespring 84 pulls back the bell crank lever 81 and lowers the link 93 sothat the link 91 will be depressed bringing the shoulder of thelower'branch of its bifurcation into line with lower stud 92 of the.

cross-arm 92-, so that in the next operation of the machine, unless thearm 4 should be again depressed, the said link 91 will be thrust forwardand the registering mechavnism put again into adding condition.

N on add connections.

Referring next to the connections through which the arm 5 operates tokeep the registering mechanism out of operation, a lever arm 5 isfastened to the inner end of the sleeve 5 which carries said lever arm 5and this oppositely extending lever arm 5 is notched at its end andembraces the rear end of a lever 102 pivoted intermediate its ends uponthe frame stud 82 and coupled at its forward end to an upwardlyextending link 103. This link is slotted at its upper end with a foot105*.

and embraces a stud 104 carried by a lever 105 which is pivoted at itsrear upon a frame stud 106 and is formed at its forward end The latteroverlies a stud 107 on the rearwardly extending branch of an arm 107which is normaly held rearward by a spring 108 so that its lower end iswithdrawn from a position where it can affect the wiper pawl 821.However. when the Non-add" lever arm 5 is depressed the lever 105 islowered and rocks the arm 107 counterclockwise so as to put its lowerend in a position to be encountered by the. wiper pawl 821 and thereforeprevent the latter from engaging the rear stud of thelev'er 913. Themain accumulator frame 910 will ,consequentlyflbe left in its forwardposition (to which it is thrown at the outset of the operation of theRepeat connections.

Turning now to the motor repeat connections, that is to say theconnections from the lever arm 6 through which keys are prevented frombeing released and the motor is caused to put the machine throughoperations automatically succeeding one another, and referringparticularly to Figs. 2 and 2, though refernce to Figs. 1 and 4 willalso be helpful, an upstanding arm 6 is secured to the forward end ofthe sleeve 6 which carries at its rear the said lever arm 6. An upperportion of this arm extends adjacent the back panel 2 of the machinecasing, as best seen in Fig. 1, and a widened portion of the arm isslotted and embraces a stud mounted upon said panel, this being merelyfor purposes of limiting the vibration of the arm. The upper end of thelever arm 6 is coupled to a yoke-shaped link 110 best illustrated inFig. 2 The central portion of this link lies closely adjacent the panel2 and is confined by an elongated keeper or guard sleeve 111 screwed tosaid panel. The link extends from a point to the right of the printingsections (as the parts are seen in Fig. 4) to a point at the leftthereof so that the operating connections from the lever arm 6 may reachover to that side of the machine Where the key-release devices and motorcontrol devices are regularly located in the machine. This is theright-hand side of the machine as viewed from the front. The said linkat its end toward this side of the machine is coupled to thelip-standing arm of a bell crank lever 112, the notched end of whosehorizontally extending arm is engaged with the rearwardly projecting arm113 of another bell crank lever which is pivoted upon a frame stud 114(Fig. 2). The

"upwardly extending arm 113 of the last with which it is yieldinglyconnected for a purpose hereinafter mentioned, the bar 116 beinglongitudinally slotted to receive studs on the bar 115. A spring 117connects one of said studs with a stud upon the bar 116, as best shownin Fig. 4. The forward end of the slide bar 116 is slottedfor guidingpurposes and embraces a frame stud 118, as shown in Figs. 2 and 1, and aspring 119 applied to said bar normally holds it forward. For thepresent this slide bar and the companion slide bar 115 may be consideredas one, so that the clockwise rocking of the bell crank lever 113-113(Fig. 2), as caused by depression of the lever arm 6, will result in arearward shift of the slide bar116. The effect of this will be todisable the key-releasing devices, if that is desired. It will dependupon whether or not a Repeat key 120 has been depressed. It is showndepressed and latched down in Fig. 2. It controls a certain abutmentlever which is carried by the aforesaid slide bar 116 and serves todisable the key-release mechanism.

The key-release devices comprise the familar detent 228, bail rod 202,ball side piece 219, wiper pawl 623, and bell crank lever 630. Thesedevices are so well known as to require no detailed description, itbeing understood that ordinarily when the full-stroke sector 311 on thehandle shaft turns, counterclockwise in the first part of the machinesoperation, the lever 630 follows it under the impulse of the familiarspring 618, and the wiper pawl 623 passes by the roller stud 262 at thelower end of the bail side-piece 219. A familiar method of providing forrepeat operations is to block the lever 630 so that it cannot follow thefull-stroke sector and consequently the wiper pawl 623 will stay abovethe before mentioned roller stud and there will be no rocking of thebail 219 to release the keys. In the present instance this blocking iseffected by the above mentioned lever on the slide bar 116, provided theRepeat key 120 is down. Said lever is designated by the numeral 121 andis pivoted intermediate its ends to said slide bar. The rear arm of thislever has a laterally projecting flange or shelf 121 which, uponrearward shift of the slide bar, may take up a position in the path of astud 630 on the lever 630; A spring 122 connects an ear of said leverwith a stud on the slide bar so as to hold the rear arm of the leverdown, putting its said flange of shelf in a position where, uponrearward shift of the slide bar, it will. take up its obstructingposition. The action of the spring is limited by the engagement of anoppositely extending lateral flange or lug 121 of the lever whichoverlies the upper edge of the slide bar.

The forward arm of the lever 121 carries a stud 121 underlying a leverarm 124. The

latter is ofirregular shape and of cam formation at the rear where itoverlies the said stud, and it constitutes one arm of a bellcrank leverwhose other arm 1241 is coupled to the key 120. A spring 125, which issuperior to the spring 122, normally holds the forward arm of the leverdown and the key 120 up and the slide bar rearward (Fig. 3 the action ofthis superior spring being limited by abutment of an edge of the arm 121 against a frame stud 125 to which the spring 125 is attached. With thekey 120 up, the condition would be as illustrated in Fig. 3 the lever121 being rocked to a position where its rear arm stands at an elevatedposition with its flange or shelf 121* so located that in a rearwardshift of the slide bar 116 this shelf will not be interposed in the pathof the stud 630 and so the downward swinging of the latter will not beinterferred with and key release will take place. On the other hand, ifthe Repeat key 120 is down, as shown in Fig. 2, thelever 121 will havebeen released from restraint by the lever arm 124 and so will occupy theposition there illustrated where its shelf 121 is so located that uponrearward shift of the slide bar 116 said shelf will stand in the path ofthe stud 630*.

The key release action is availed of in the matter of repeat operationsof the machine by the motor drive. Reference may be had to theKilpatrick Patent No. 928,981 for particulars of motor starting deviceswhich are now quite well known in the commercial art. The referencenumeral 126 designates the familiar touch bar which is mounted uponspring-connected levers 127 and 127 the former having a pin and slotconnection with the familiar vertical bar 128 with which said lever isconnected by a spring 129. In the present instance a latch 130" pivotedupon. the lever 126 and connected to it by a spring 131, is adapted,upon depression of the touch bar, to engage with a stud 127 upon thelever 127 and thus prevent restoration of the lever and touch bar tonormal position. The condition here referred to is illustrated in Fig.2, the vertical bar 128 being drawn upward by the spring 129 so as toclose the motor clutch and start the machine in operation. It will beunderstood that, as in the well known construction depicted in saidKilpatrick patent, the roller stud 311 on the full stroke sector 311will operate to depress said bar 128 and open the clutch of the motor,but with the touch bar latched down, it 'is obvious that, the spring 129will remain in tension and the bar 128 will therefore be again elevatedso that a second operation of the machine will automatically ensue.

A slide bar 1410 "arranged between the keyboard plates and drawnrearward by a spring 141 has a lateral lug 14:0? adapted to act 130 isdisclosed in the aforesaid Lundgren Pat- 1 upon the upstanding tail ofthe latch 130. The rear end of this slide bar extends in the path of anupward extension of the bail side piece 219. Therefore when the Repeatlever arm 6 is released and the spring 119 pulls the bar 116 forward,removing the shelf or flange 121 from under the stud 630 and in anensuing operation of the machine the key-release bail is vibrated, saidupward extension of the bail side piece 219 will strike the rear end ofthe slide bar 140 and thrust it forward, unlact-hing the motor startinglevers so that at the conclusion of the operation the vertical bar 128will remain down and the clutch of the motor open.

A very similar motor repeat mechanism ent 1,033,108 to which referencemay be made if desired for a more detailed explanation of the manner ofcontrol of the electric drive for purposes of an automatic succession ofoperations of the machine in connection with disablement of thekey-release devices.

Reverting now to the matter of yiedingly connected slide bars 115 and116, this characteristic is availed of in case of the machine beingequipped with what is termed a Carriage normal key, such as thatdesignated 205 in the Kilpatrick Patent 1,152,517, and here designated145.

The lower part of the stem 145 of this key has a stud 145 engaging aslotted end of one leg of a bell crank lever 144 mounted on a frame stud145, the upper leg of said bell crank having a squared end 144 formingan abutment which, when the key is depressed, will take up a positionimmediately in rear of a stud 116 on the bar 116 so that depression ofthe lever arm 6 by a carriage roller will merely shift the bar 115rearward, stretching the spring 117, the bar 116 being locked and therepeat devices therefore disabled. In case the link 116 should berearward when the key 145 is depressed, the bell crank lever 144 will soact upon the roller stud 116 as to restore the said link to its forwardposition.

Timing repeat operation.

I have before'alluded to the fact that a repeat operation of the machineis not permitted to take place until the paper carriage has taken up itsnew columnar posi tion. For this purpose I employ certain timing devicesin connection with the above described repeat controlling mechanism andthe above described motor starting mechanism. I have referred to thefact that with the touch bar and its levers latched down, the verticalclutch controlling bar 128 will be again elevated for clutch-closingpurposes, under the action of the spring 129. Such action of thisvertical bar is, however, stayed, pending arrival of the paper carriageaseaeve at the new columnar position. For this purpose an abutment arm150 is hung from a key-board cross-shaft 200 so that its lower end willstand in the path of a roller stud 128 on the bar 128 and block the riseof the latter' as illustrated in Fig. 3 Now the slide bar 115, which isoperated by the Repeat lever arm 6, is formed with an upstanding finger115 which extends in front of a stud 150 on said arm 150, and the leverarm 6 is given a special formation so that it may partake of excessmovement, that is to say movement beyond that required to put-theobstructing shelf 121 into the path of the stud 6230*. Referring toFigs. 6 and 2*, it will be seen that the upper terminal edge of said armis of an inverted V-shape. In case of the carriage shift involving theriding of a roller upon the said lever arm, that roller will ride overand beyond the apex of this V-shaped portion of said arm so as to givethe latter the excess movement, which is of course transmitted to theslide bar 115. This movement is such as to cause the upstanding finger115 of said slide bar to operate upon the stud 150 and bring the arm 150rearward to the position shown in Fig. 3. This removes the lower end ofthe arm from over the roller stud 128 so that the vertical bar 128 maythereupon rise and close the motor clutch.

In Fig. 2 three different positions of a carriage roller over the leverarm 6 are indicated by circles numbered respectively, 1, 2, and 3. TheNo. 1 circle represents the roller at the apex of the V. It does notrest there but having depressed the arm to the maximum extent, with theeffect above described, moves on, and may come to rest in either of theother two positions indicated. At the No. 2 position it will hold downthe arm sufficiently to keep the shelf 121 in the path of the stud 630Thiswouldbe the case with the carriage in the first, second or thirdcolumnar position of the example hereinbefore explained. It will berecalled that in the fourth position of the carriage the repeat devicesdo not remain set. Here the roller would occupy the No. 3 position,beyond the V, and so not be depressing the lever arm.

The said blocking-arm 150 also functions as one of a pair of jaws ordetents such as illustrated in the Kilpatrick Patent No. 928,981 andthere designated 6 and 6 The companion jaw detent is here designated152, being connected with the other jaw by a spring 153 so that the twowill function the same as in said Kilpatrick patent. However, in view ofthe fact that the jaw 150 is given such different formation in thepresent instance as to enable it to flmction also as a block against therise of the vertical bar 128, it is necessary to' provide for its beingnormally restrained so as to permit of the stud 128 entering between thetwo jaws ward extension with a downwardly inclined cam finger 150 andthe before-mentioned stud 127 on the lever 127 is adapted, when thatlever is in normal position with its rear arm lowered, to bear upon theupper edge of said cam finger and constrain the arm 150 to assume arearward position as illustrated in Fig. 3. This removes its lower edgefrom above the stud 128 and properly positions its front edge withrelation to the rear edge of the lower'portion of the companion arm 152to present a flaring mouth to the stud 128' such as that supplied by theedges e and e in the Kilpatrick construction. It will, of course, beunderstood that with the elevation of the rear arm of the lever 127attendant upon depression, of the touch bar, the arm 150 will bereleased fromrestraint so that it may fully close upon the stud 128 Thecondition here referred to is illustrated in Fig. 2 which corres onds inthis respect with Fig. 2 of said I ilpatrick patent. It will further beunderstood that here as there, the formation of the detents or jaws issuch that when the full-stroke sector stud 311 operates upon thevertical bar 128, the jaws will yield and permit the sltlud 128 to passdownward from between t em.

Hammer block connections.

1909, is followed. Thus'printing is pre-- vented by early release ofhammers so that they are deprived of percussive function.

I have before pointed out that the printing mechanism of the machine issubdivided into as many as three sections. The printing mechanism properis that long familiar in Burroughs adding machines comprising a gang ofhammers 715 and hammer driving levers 716 and latches 717 which normallyrestrain the hammers. The splitting or subdividing is done in the usualway by omitting over-lapping tails between latches, and in the presentinstance the split is apermanent one. same character as the couplingsshown in the Kilpatrick Patent 1,152,517 (and the Vincent 1,166,096 ofDecember 28, 1915) are employed for purposes of the so-called hammerblocking. Then the first or date section of the printing mechanism isitself sub-divided, in soy far as concerns cotiperative tripping actionbetween the first and second latches, inasmuch as there should ofHowever, certain devices of the course be no cipher printed between amonth abbreviation and a day date when the latter has but a singlenumeral. Therefore the first latch 717 which controls the hammer.

for printing the month abbreviation does not have a tail over-lappingthe next adjacent latch which controls the hammer for printing a tensnumeral of a day date. However, for purposes of hammer blocking thesetwo latches are provided with coupling devices so that a preliminarytripping of the middle one of the -three latches of this section of theprinting mechanism will be accompanied by a tripping of the other two,it being observed that the middle latch has a tail over-lapping thethird latch, as shown in Fig. 4. There is applied to this middle latch apitman 717 like that designated by this same numeral in said Kilpatrickpatent, and there is a catch 717 pivoted upon this pitman, whichcorresponds with the catch designated by the same nu meral in saidpatent, said catch being normally upheld by a spring 717. In the presentinstance the catch has a lateral stud 717 (Fig. 4 which, when the catchis depressed, will take a position in front of the latterly turned endof a pitman 717 that is pivotally connected at its forward end to thefirst latch 717.

The catch 717 has a shoulder a (Fig. 1 on its underside which isnormally above the path of movement of the cross bar 160 of a bail whichis vibrated in every operation of the machine. hen the catch isdepressed (through connections presently to be described extending fromthe hammer block lever arm 7) the said shoulder is brought into the pathof said cross-bar, so that at the outset of the operation of the machinethe pitman 717 will the drawn rearward. and with it the pitman 717? andso the three latches of this section of the printing mechanism will betripped and their hammers released and therebyideprived of percussivefunction.

I have heretofore mentioned that the second section of the printingmechanism has five sets of printing devices which, of course, means thatthere are here five hammers to be controlled. The latch controlling thefirst of these hammers has a pitman similar in all respects to thatwhich is applied to the middle latch of the first-described section, andlikewise a catch of the same sort, and furthermore this catch isadapted, when depressed, to be operated upon by the same bail cross-baralready described. The eifect will be, of course, to trip all of thelatches of the second section of the printing mechanism and deprivetheir hammers of percussive function so that printing is prevented. Theremaining, or amount printing section of the printing mechanism,similarly has a pitman and

